Do you ever get those times..

when your staring at something for what seems like forever, and you cant 100% make out what it is, but you convince yourself its something, but turns out to be something totally different?

I just finished watching 4th kind and was walking up my stairs and saw something moving at the top and convinced myself it was an alien, I was even thinking like"yeah, thats the head alright". Turns out it was my dog. Who knew?